1786    Opening night of the opera ''The Marriage of Figaro'' by Wolfgang Amadeus Mozart in Vienna, Austria.

1791    ''The Magic Flute'', the last opera composed by Mozart, receives its premiere performance at Freihaus-Theater auf der Wieden in Vienna, Austria.

1824    World premiere of Ludwig van Beethoven's Ninth Symphony in Vienna, Austria. The performance is conducted by Michael Umlauf under the composer's supervision.

1829    Accordion patent granted to Cyrill Demian in Vienna.

1848    Robert Blum, a German revolutionary, is executed in Vienna.

1870    The inauguration of the Musikverein in Vienna.

1873    ''Der Krach'': Vienna stock market crash heralds the Long Depression.

1903    Anton Bruckner's 9th Symphony receives its first performance in Vienna.

1921    The International Working Union of Socialist Parties is founded in Vienna.

1927    Massacre of July 15, 1927: 89 protesters are killed by the Austrian police in Vienna.

1945    World War II: Soviet Union forces invade Austria and take Vienna; Polish and Soviet forces liberate Gdańsk.

1971    The Convention on Psychotropic Substances is signed at Vienna.

1985    Palestinian guerrillas kill eighteen people inside Rome and Vienna airports.

1988    The United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances is signed in Vienna.